Salting-out assisted solvent extraction of L (+) lactic acid obtained after fermentation of sugarcane bagasse hydrolysate

Baral, Pratibha; Pundir, Anushka; Kurmi, Akhilesh Kumar; Singh, Raghuvir; Kumar, Vinod; Agrawal, Deepti

doi:10.1016/j.seppur.2021.118788

Cited by 19 publications

(8 citation statements)

References 29 publications

(35 reference statements)

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“…As stated before, one of the advantages of working at a low pH is the simplification of the downstream processes for extraction and purification. Novel methods have been tested for LA extraction, 54 such as: electrodialysis, 55 adsorption, 56 membrane separation, 57 and solvents 58 . Moreover, since the LA is present in liquid form, the possibility of combining the production system with the extraction phase can allow for the continuous separation and concentration of LA while avoiding further problems, like LAB inhibition due to LA accumulation 28,51 …”

Section: Discussionmentioning

confidence: 99%

Effect of pH on lactic acid fermentation of food waste using different mixed culture inocula

Pau

Tan

Lens

2021

J of Chemical Tech & Biotech

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BACKGROUND Increasing amounts of food waste (FW) have become a critical problem in the last few decades. Sustainable methods to limit the impact of FW on the environment are required. FW valorisation through lactic acid (LA) fermentation can assist by producing a valuable commodity from a cheap substrate. LA is a chemical with increasing market potential, it is used in several industrial sectors, and it is the main component of polylactic acid bioproducts. RESULTS The role of pH on LA production from FW was tested with three anaerobic inocula and a control with solely FW. The most suitable condition for LA production was at pH < 4. The best results in terms of final LA concentration (1.8 gCOD L–1), yield (224 mgCOD/gVS), and COD conversion (50%) were found in uncontrolled pH conditions with no external inoculum addition. FW already has a good abundance of LA bacteria that are responsible for lactate production. Among the external inocula supplied, primary sludge best enabled LA accumulation at a high concentration (1.3 g COD L–1) and yield (167 mgCOD/gVS). CONCLUSION This study demonstrates that the reactor pH is a key factor to stimulate LA acid fermentation and its accumulation. Under acidic conditions, LA accumulated in the system instead of being converted to volatile fatty acids (VFAs); this was likely due to the inhibition of the microbial community responsible for VFAs production. Uncontrolled pH condition impacts positively the overall fermentation cost since the alkalinizing agents used to keep pH neutral are not required and simplifies the downstream processes for LA extraction and purification. © 2021 Society of Chemical Industry (SCI).

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Section: Discussionmentioning

confidence: 99%

Effect of pH on lactic acid fermentation of food waste using different mixed culture inocula

Pau

Tan

Lens

2021

J of Chemical Tech & Biotech

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“…The concentrated aqueous phase rich in AS can be used as supplement of nitrogen source for the next batch of fermentation. The other possibility could be precipitation of salt by addition of 2 volumes of methanol or chilled acetone (Baral et al, 2021) and recycling of it for next round of downstream processing.…”

Section: Bdo Separation From Unfiltered Fermentationmentioning

confidence: 99%

High yield recovery of 2,3-butanediol from fermented broth accumulated on xylose rich sugarcane bagasse hydrolysate using aqueous two-phase extraction system

Narisetty

Amraoui

Abdullah

et al. 2021

Bioresource Technology

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“…9 The membrane method is limited by the high membrane cost and membrane pollution. 8 The LLE method is an effective separation process; however, the traditional solvents tributyl phosphate (TBP), trioctylphosphine oxide (TOPO), and trioctylamine (TOA) have negative effects on human health and the environment because they are toxic and flammable. 10,11 In addition, when using these traditional solvents, acid stripping is carried out with sodium hydroxide solution, sodium carbonate, or ammonium bicarbonate.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Several traditional methods are used to recover organic acids from fermentation broth such as adsorption, precipitation, membrane separation, and liquid–liquid extraction (LLE). , However, these methods have some disadvantages. Precipitation generates a large amount of gypsum waste, causing environmental and economic burdens .…”

Section: Introductionmentioning

confidence: 99%

“…Precipitation generates a large amount of gypsum waste, causing environmental and economic burdens . The membrane method is limited by the high membrane cost and membrane pollution . The LLE method is an effective separation process; however, the traditional solvents tributyl phosphate (TBP), trioctylphosphine oxide (TOPO), and trioctylamine (TOA) have negative effects on human health and the environment because they are toxic and flammable. , In addition, when using these traditional solvents, acid stripping is carried out with sodium hydroxide solution, sodium carbonate, or ammonium bicarbonate. , The re-extract is then treated with a strong acid to convert sodium lactate to the free lactic acid form; the process is tedious and increases the production cost .…”

Section: Introductionmentioning

confidence: 99%

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Separation of Lactic Acid Based on Amide-Based Hydrophobic Deep Eutectic Solvents: Insights from Experiments and Molecular Dynamics Simulations

Liu

Wei

et al. 2022

ACS Sustainable Chem. Eng.

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Nowadays, the development of appropriate technologies is of great significance for society. To avoid the negative impact of traditional separation methods on the environment, novel biodegradable amides were used for the separation of lactic acid (LA) by the in situ formation of deep eutectic solvents (DESs). The formation mechanism was explained by quantum chemical calculations and FT-IR analysis. In addition, the stripping of LA was performed by hydrophobic DESs interacting with water, and the amide in DESs was regenerated and reused. Meanwhile, the classical molecular dynamics simulations were adopted to describe the complex mixture of the amide–LA–water system structures and properties in depth. The essence of interaction between hydrophobic DESs and water is a dynamic reversible phase equilibrium process. This study provides a new direction for the development of clean technology such as carboxylic acid separation and also provides guidance for the design of hydrophobic DESs.

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Salting-out assisted solvent extraction of L (+) lactic acid obtained after fermentation of sugarcane bagasse hydrolysate

Cited by 19 publications

References 29 publications

Effect of pH on lactic acid fermentation of food waste using different mixed culture inocula

Effect of pH on lactic acid fermentation of food waste using different mixed culture inocula

High yield recovery of 2,3-butanediol from fermented broth accumulated on xylose rich sugarcane bagasse hydrolysate using aqueous two-phase extraction system

Separation of Lactic Acid Based on Amide-Based Hydrophobic Deep Eutectic Solvents: Insights from Experiments and Molecular Dynamics Simulations

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